Woody Allen has been playing himself for so many years now that one wonders if his personality might, at some stage, actually run out. He admits that when he is filming he grows tired of his image and, for the past few years, audiences have tired of it too. But when asked if he worries whether he might, one day, stop being funny he says, "Well, no. Because if I wake up, I'm going to be funny, because it's me. It's not that I put on a thing to do it; I wake up in the morning and I can write. I roll out of bed and I can write; I can write - that's what I do, that's me. So it would have to be a complete personality change for that to happen." Emma Brockes speaks with Allen.